from flask import render_template, session, current_app, abort, request, jsonify, g

from info import constants, db
from info.models import User, News, Comment, CommentLike
from info.modules.news import news_blu

# 127.0.0.1 : 5000/news/2
from info.utils.common import user_login_data
from info.utils.response_code import RET


@news_blu.route("/followed_user",methods = ["POST"])
@user_login_data
def followed_user():
    user = g.user
    if not user:
        return jsonify(errno=RET.SESSIONERR,errmsg = "用户未登录")
    # 1.获取参数
    user_id = request.json.get("user_id")
    action = request.json.get("action")
    # 2.校验参数
    if not all([user_id,action]):
        return jsonify(errno=RET.PARAMERR,errmsg = "参数错误")
    if action not in("follow","unfollow"):
        return jsonify(errno=RET.PARAMERR, errmsg="参数错误")
    # 3.取到要被关注的用户
    try:
        other = User.query.get(user_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.DBERR, errmsg="数据查询错误")
    if not other:
        return jsonify(errno=RET.NODATA, errmsg="查询数据失败")
    # 4.根据要执行的操作去修改对应的数据
    if action == "follow":
        if other.id == user.id:
            return jsonify(errno=RET.ROLEERR, errmsg="不可以关注自己!")
        if other not in user.followed:
            user.followed.append(other)

        else:
            return jsonify(errno=RET.DATAEXIST, errmsg="当前用户已被关注")
    else:
        # 取消关注
        if other in user.followed:
            user.followed.remove(other)
        else:
            return jsonify(errno=RET.DATAEXIST, errmsg="当前用户未被关注")
    return jsonify(errno=RET.OK, errmsg="操作成功")




@news_blu.route('/comment_like',methods=["POST"])
@user_login_data
def comment_like():
    """
    评论点赞
    :return:
    """
    user = g.user
    if not user:
        return jsonify(errno=RET.SESSIONERR,errmsg = "用户未登录")
    # 1.取到请求参数
    news_id = request.json.get("news_id")
    comment_id = request.json.get("comment_id")
    action = request.json.get("action")
    # 2.校验参数
    if not all([news_id,comment_id,action]):
        return jsonify(errno=RET.DBERR,errmsg="参数错误")
    if action not in (['add','remove']):
        return jsonify(errno=RET.PARAMERR,errmsg="参数错误")
    try:
        news_id=int(news_id)
        comment_id=int(comment_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.PARAMERR,errmsg="参数错误")

    # 从数据库查询评论
    try:
        comment = Comment.query.get(comment_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno = RET.DBERR,errmsg="数据查询错误")
    if not comment:
        return jsonify(errno = RET.NODATA,errmsg="评论不存在/")

    if action == "add":
        comment_like_model = CommentLike.query.filter(CommentLike.user_id==user.id,
                                                      CommentLike.comment_id==comment.id).first()
        if not comment_like_model:
            # 点赞评论
            comment_like_model = CommentLike()
            comment_like_model.comment_id=comment.id
            comment_like_model.user_id=user.id
            db.session.add(comment_like_model)
            comment.like_count +=1
    # 取消点赞
    else:
        comment_like_model = CommentLike.query.filter(CommentLike.user_id==user.id,
                                                      CommentLike.comment_id==comment.id).first()
        if comment_like_model:
            db.session.delete(comment_like_model)
            comment.like_count -=1

    # 添加到数据库
    try:
        db.session.commit()
    except Exception as e:
        db.session.rollback()
        current_app.logger.error(e)
        return jsonify(errno=RET.DBERR,errmsg="数据库操作失败")
    return jsonify(errno=RET.OK,errmsg="成功")



@news_blu.route('/news_comment',methods=["POST"])
@user_login_data
def comment_news():
    """
    评论新闻或回复某条新闻下的评论
    :return:
    """
    user = g.user
    if not user:
        return jsonify(errno=RET.SESSIONERR,errmsg = "用户未登录")
    # 1.取到请求参数
    news_id = request.json.get("news_id")
    comment_content = request.json.get("comment")
    parent_id = request.json.get("parent_id")

    # 2.判断参数
    if not all ([news_id,comment_content]):
        return jsonify(errno=RET.DBERR,errmsg="参数错误")
    try:
        news_id = int(news_id)
        if parent_id:
            parent_id =int(parent_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.PARAMERR, errmsg="参数错误")
    # 3.查询新闻是否存在
    try:
        news = News.query.get(news_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.DBERR,errmsg="参数错误")
    if not news:
        return jsonify(errno=RET.NODATA,errmsg="未查询到新闻数据")
    # 4.初始化一个评论模型，并赋值
    comment = Comment()
    comment.user_id = user.id
    comment.news_id = news_id
    comment.content =  comment_content
    if parent_id:
        comment.parent_id = parent_id

    # 添加到数据库
    # 因为在return的时候需要用到，所以要手动commit的id
    try:
        db.session.add(comment)
        db.session.commit()
    except Exception as e:
        current_app.logger.error(e)
        db.session.rollback()
    return jsonify(errno = RET.OK,errmsg="评论成功",data = comment.to_dict())


@news_blu.route('/news_collect',methods = ["POST"])
@user_login_data
def news_collect():
    """
    1.  接受参数
    2.　校验参数
    3.　查询新闻，判断新闻是否存在
    :return:
    """
    user = g.user
    if not user:
        return jsonify(errno=RET.SESSIONERR,errmsg = "用户未登录")
    # 1. 接受参数
    news_collect_model = request.json
    news_id = news_collect_model.get("news_id")
    action = news_collect_model.get("action")
    # 2. 校验参数
    if not all ([news_id,action]):
        return jsonify(errno = RET.DBERR,errmsg = "参数错误")
    if not action in (["collect","cancel_collect"]):
        return jsonify(errno=RET.DBERR, errmsg="参数错误")
    try:
        news_id = int(news_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.PARAMERR, errmsg="参数错误")
    # 3.查询新闻，判断新闻是否存在
    try:
        news = News.query.get(news_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.DBERR, errmsg="数据查询错误")
    if not news:
        return jsonify(errno=RET.NODATA, errmsg="未查询到新闻数据")
    # 4.收藏及取消收藏
    if action =="collect":
        if news not in user.collection_news:
            user.collection_news.append(news)
    else:
        if news in user.collection_news:
            user.collection_news.remove(news)

    return jsonify(errno=RET.OK,errmsg="操作成功")



@news_blu.route('/<int:news_id>')
@user_login_data
def news_detail(news_id):
    """
    新闻详情
    :param news_id:
    :return:
    """
    # 1.查询用户登录信息
    user = g.user
    # user_id = session.get("user_id",None)
    # user = None
    # if user_id:
    #
    # # ２．尝试查询用户信息
    #     try:
    #         user = User.query.get(user_id)
    #     except Exception as e:
    #         current_app.logger.error(e)

    # ３．右侧新闻逻辑排行
    news_list = []
    try:
        news_list = News.query.order_by(News.clicks.desc()).limit(constants.CLICK_RANK_MAX_NEWS)
    except Exception as e:
        current_app.logger.error(e)

    # 定义一个空的字典列表，里面装的就是字典
    news_dict_li = []
    # 遍历对象列表，将对象的字典添加到字典列表中
    for news in news_list:
        news_dict_li.append(news.to_basic_dict())

    # 查询新闻数据
    news = None

    try:
        news = News.query.get(news_id)
    except Exception as e:
        current_app.logger.error(e)
    if not news:
        abort(404)
    # 更新新闻点击次数
    news.clicks +=1

    is_collected = False
    # 判断是否收藏该新闻
    if user:
        if news in user.collection_news:
            is_collected =True

    # 去查询评论的数据
    comments=[]
    try:
        comments=Comment.query.filter(Comment.news_id ==news_id).order_by(Comment.create_time.desc()).all()
    except Exception as e:
        current_app.logger.error(e)
    comment_like_ids=[]
    if g.user:
        try:
            # 需求：查询当前用户在当前新闻里点赞了哪些评论
            # 1.查询出当前新闻的所有评论[COMMENT]　取到所有评论的ｉｄ
            comment_ids = [comment.id for comment in comments]
            # 2.在查询出当前评论中哪些评论被当前用户所点赞,查询comment_id在第一步评论列表内的所有数据CommentLike.user_id=g.user.id
            comment_likes = CommentLike.query.filter(CommentLike.comment_id.in_(comment_ids),CommentLike.user_id ==g.user.id).all()
            # 3.取到所有被点赞评论的id，第二步查询出来是[CommentLike]
            comment_like_ids = [comment_like.comment_id for comment_like in comment_likes]
        except Exception as e:
            current_app.logger.error(e)

    comments_dict_list=[]
    for content in comments:
        comment_list=content.to_dict()
        # 代表没有点赞
        comment_list["is_like"] = False
        if content.id in comment_like_ids:
            comment_list["is_like"] = True
        comments_dict_list.append(comment_list)
    is_followed = False
    # if当前新闻有作者，并且当前登录的用户关注过这个作者
    if news.user and user:
        # if user 是否关注过news.user
        if news.user in user.followed:
            is_followed = True

    data = {
        "user": user.to_dict() if user else None,
        "news_dict_li": news_list,
        "news":news.to_dict(),
        "is_collected":is_collected,
        "comments":comments_dict_list,
        "is_followed":is_followed
    }

    return render_template('news/detail.html',data=data)

